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A028351
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Dimension of invariant subspace of Lie polynomials of degree 2n under action of SL_2(C) on free Lie algebra of rank 2.
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0
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1, 0, 1, 1, 5, 9, 33, 85, 276, 827, 2693, 8626, 28639, 95393, 323367, 1104525, 3813797, 13266366, 46509357, 164098390
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OFFSET
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1,5
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REFERENCES
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M. Bremner, Lie invariants of degree ten, Int. J. Math. Game Theory Algebra, 8 (1998), no. 2-3, 115-122.
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LINKS
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FORMULA
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Formula in C. Reutenauer, Free Lie Algebras, pages 206-208.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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